Screen hook strip



Oct. l5, 1940. A J- 'RQUBAL 2,217,920

SCREEN HOOK STRIP Filed NOV. 28, 1938 Patented Oct. 15, 1940 UNITEDSTATES 2,217,920 v SCREEN nooxs'rmr Alexander J. Roubal, wauwatosahwis.,assignor to Allis-Chalmers Manufacturing Company,

Milwaukee, Wis., a

corporation of Delaware Application November 28, 1938, Serial No.242,785

Claims.

This invention pertains to a screen fastener and relates particularly toend hooks used on the edges of sections of woven screen cloth utilizedin vibrating and other screens.

It is an object of this .invention to provide a construction of hookstrip which is rugged and easy to manufacture, and which retains thewoven screen cloth uniformly along the entire edge thereof, makingeffective vibration of the entire screen cloth possible.

The invention is illustrated by the preferred modifications shown in thedrawing appended hereto, wherein:

Fig. 1 shows a screen assembly embodying end strips in accordance withthe invention;

Figs. 2, 3, and 4 show various steps in the process of assembling a hookstrip in accordance with the invention; and

Figs. 5 and 6 show other modifications of the strip fasten-erconstruction.

Referring to the drawing in more detail, Fig. 1 shows a screen assemblyof the type disclosed in U. S. patent to Lincoln 1,999,769, April 30,1935.

u This comprises generally a screen section Ill reinforced and supportedat its side edges by means of end books II which are supported in placeby lever plates I2 fastened to side walls I4 of the screen body by meansof screws I3. This general screen assembly forms no part of the presentinvention and is briey described merely to indicate the manner ofutilizing the screen hook of the present invention.

To assemble the preferred form of end hook in accordance with thisinvention, the woven screen u section III is superimposed on the wideouter stripy I6, which is usually made of sheet metal, the outer edgesof the screen and strip substantially coinciding. Then the inner stripI1 is super-imposed on screen cloth I0, the outer edge of strip I1 beingspaced inwardly from the outer edges of strip I6 and screen cloth I0, asshown in Fig. 2. The next step is to bend the outer ends of screensection Ill and strip I6 over the outer edge of strip 45 II to form a Uas shown at I61 in Fig. 3. Then it is merely necessary to bend bothstrips and screen through an angle of over 90 at some point I8, as shownin Fig. 4, in order to obtain the nished screen fastener or end hook.

It will be noted that the first bent strip, as shown in Fig. 3, servesto fasten the screen 4cloth tightly between strips I6 and I1; while thesecond bent strip serves to stretch and intimately clamp the screencloth uniformly along the full length thereof.

55 The construction shown in Fig. 5 is somewhat similar to that shown inFig. 4 except that the outer strip I9, instead of terminating evenlywith the edge of the screen cloth, extends in a U around the edge of thescreen, as shown at 23, and forms a reverse U bend around the edge ofstrip I1, overlapping strip I 1 at 24. The particular advantage of thismodification over that of Fig. 4 is that strip I9 covers the edge ofstrip I1, preventing any possible cutting or weakening of the screencloth by contact with this edge, which may srntimes be sharp enough todamage the screen c o The construction of Fig. 6 is also built around a.strip I1, as in Figs. 4 and 5. The screen I0 is bent over one edge ofthis strip, as in the constructions described above, but a wider marginis shown between the edge of the screen cloth and the free edge of stripIl. The other strip 25 is laid over strip Il, and bent over the freeedge of said strip, terminating at 26. It will be seen that thisconstruction is generally similar to that of Fig. 4, but the strip 25diiers from strip I'I in having its major portion inside the angleformed by the two legs of strip I'I rather than on the outside thereof.This construction is particularly adaptable for coarse screen cloth,where great tension is applied thereto and it is desired to have morethan one thickness of metal between the screen cloth and a fasteningmeans such as plate I2.

It is not desired to limit the invention to the exact details hereinshown and described, as modiilcations within the scope of the inventionwill occur to those skilled in the art.

It is claimed and desired to secure by Letters Patent:

1. An end hook for a section of screen cloth comprising a long integralstrip having two longitudinal sections arranged at an angle ofsubstantially less than 90, a woven wire cloth having one straight edgeextending beyond an edge of said strip and bent over said edge inU-shape, a second long strip having an edge overlying said bent overedge of said wire cloth, an intermediate portion bent over saidl bentover edge of said rst strip to form a U, and another portion comprisingthe other edge of said second strip parallel to the other section ofsaid rst strip.

2. An end hook for a rectangular screensection comprising a firstintegral long strip having two longitudinal legs arranged at an angle ofsubstantially less than 90, a second strip having one longitudinal legparallel to one leg of said rst strip and coextensive therewith and -asecond longitudinal leg bent into U-shape and substantially parallel tothe other leg of said rst strip, a woven screen cloth arranged betweenseid ilrst legs of said strips and having an edge within said U- shapedportion of said second strip, said U- shaped portion of said secondstrip and the screen cloth therein being further bent around the edge ofsaid other leg of said first strip.

3. An end hook for a rectangular screen cloth section comprising'astraight long strip having two longitudinal legs arranged at an acuteangle, a rectangular screen cloth having one longitudinal edgecontacting the outer surface of said strip and forming a U around oneedge thereof, and a second straight long strip forming a U and overlyingsaid U-shaped portion ofthe screen edge.

4. An end hook for a screen cloth comprising a first strip havingtwolegs making an acute angle with each other, a rectangular screencloth having one rectilinear edge contacting the outer surfaces of saidstrip and forming a U around one edge thereof, and a second strip havingtwo legs parallel to and Within said ilrst strip. one leg of said secondstrip being bent over said U-shaped screen cloth, said nrst and secondstrips clam ing said screen cloth between them.

5. An end hook tor a section of screen cloth having oppositely disposedsubstantially straight edges comprising a long narrow strip spaced fromone of said edges and being arranged with its long axis parallel to saidedge. said edge ot said screen cloth being bent over to overlie said10118 narrow strip, a wider strip overlying said bent over screen clothedge and bent back to protect the side of the screen cloth opposite tothat covered by said tlrst strip, both strips and the screen cloththerebetween being bent through an angie substantially greater than 90to form an end hook.

ALEXANDER J. ROUBAL.

